US7911162B2 - Motor drive device and control method - Google Patents

Motor drive device and control method Download PDF

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US7911162B2
US7911162B2 US12/226,103 US22610307A US7911162B2 US 7911162 B2 US7911162 B2 US 7911162B2 US 22610307 A US22610307 A US 22610307A US 7911162 B2 US7911162 B2 US 7911162B2
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controller
operation mode
voltage
control method
boosted
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US20090121669A1 (en
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Hideto Hanada
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Denso Corp
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Toyota Motor Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/28—Arrangements for controlling current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/02—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit
    • B60L15/025—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles characterised by the form of the current used in the control circuit using field orientation; Vector control; Direct Torque Control [DTC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/51—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by AC-motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/082—Selecting or switching between different modes of propelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/085—Changing the parameters of the control units, e.g. changing limit values, working points by control input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/14—Boost converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2209/00—Indexing scheme relating to controlling arrangements characterised by the waveform of the supplied voltage or current
    • H02P2209/09—PWM with fixed limited number of pulses per period
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/907—Specific control circuit element or device
    • Y10S388/912—Pulse or frequency counter

Definitions

  • the present invention relates to a motor controller, and particularly to a motor controller for a vehicle.
  • Japanese Patent Laying-Open No. 2005-45880 describes switching of a control method of an inverter among a sinusoidal wave pulse-width-modulation (PWM) control, an overmodulation PWM control, and a rectangular-wave control in a hybrid car having such a boost converter.
  • PWM sinusoidal wave pulse-width-modulation
  • the rectangular-wave control involves a smaller switching loss and has higher system efficiency than the sinusoidal wave PWM control and the overmodulation PWM control.
  • the rectangular-wave control is susceptible to transient disturbance and therefore following is possible only in a limited range. Consequently, it is necessary to set a region where the rectangular-wave control is carried out (hereinafter referred to as “rectangular-wave control region”) with a margin, and therefore there is a limit to enhancement of the system efficiency.
  • the rectangular-wave control region may be expanded for some drivers.
  • the invention is a motor drive device including: a booster boosting a power supply voltage and outputting a boosted voltage; an inverter receiving the boosted voltage from the booster and driving a motor; and a controller giving a target value of the boosted voltage to the booster and setting one of a rectangular-wave control and a non-rectangular-wave control as a control method of the inverter.
  • the controller can select from a first operation mode for giving a first boosted target value and designating the non-rectangular-wave control as the control method and a second operation mode for giving a second boosted target value lower than the first boosted target value and designating the rectangular-wave control as the control method in response to a same predetermined input signal indicating a torque request.
  • the controller can select from first commanded torque and second commanded torque change of which is moderated as compared with the first commanded torque in response to a same predetermined input signal indicating a torque request, selects the first commanded torque when the controller selects the first operation mode, and selects the second commanded torque when the controller selects the second operation mode.
  • the motor drive device further includes an input switch providing an instruction as to which of the first and second operation modes should be selected to the controller.
  • the motor drive device further includes a mode informing unit making an operator recognize which one of the first and second modes is selected.
  • the controller switches the operation mode from the first operation mode to the second operation mode when a traffic jam is predicted in a course.
  • a motor drive device including: a booster boosting a power supply voltage and outputting a boosted voltage; an inverter receiving the boosted voltage from the booster and driving a motor; and a controller giving a target value of the boosted voltage to the booster and setting one of a pulse-width-modulation control and a non-pulse-width-modulation control as a control method of the inverter.
  • the controller can select from a first operation mode for giving a first boosted target value and designating the pulse-width-modulation control as the control method and a second operation mode for giving a second boosted target value lower than the first boosted target value and designating the non-pulse-width-modulation control as the control method in response to a same predetermined input signal indicating a torque request.
  • the controller can select from first commanded torque and second commanded torque change of which is moderated as compared with the first commanded torque in response to a same predetermined input signal indicating a torque request, selects the first commanded torque when the controller selects the first operation mode, and selects the second commanded torque when the controller selects the second operation mode.
  • the motor drive device further includes an input switch for providing an instruction as to which of the first and second operation modes should be selected to the controller.
  • the motor drive device further includes a mode informing unit for making an operator recognize which one of the first and second modes is selected.
  • the controller switches the operation mode from the first operation mode to the second operation mode when a traffic jam is predicted in a course.
  • FIG. 1 is a circuit diagram of a motor drive device according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing control methods for controlling an inverter 14 by a controller 30 in FIG. 1 .
  • FIG. 3 is a diagram showing how to determine the control method at a certain boosted voltage.
  • FIG. 4 is a diagram for explaining a relationship between a boosted voltage by a boost converter and the control methods in FIG. 3 .
  • FIG. 5 is a flow chart showing a control configuration of a program executed by controller 30 in FIG. 1 for determining the boosted voltage and the control method.
  • FIG. 6 is a diagram showing maps for determining the boosted voltage with respect to a load.
  • FIG. 7 is a diagram showing maps for determining requested torque with respect to an accelerator press-down degree.
  • FIG. 8 is a waveform diagram for explaining another example for moderating change of the requested torque.
  • FIG. 1 is a circuit diagram of a motor drive device according to the embodiment of the invention.
  • the motor drive device 100 includes a direct-current power supply B, voltage sensors 10 , 13 , system relays SR 1 , SR 2 , capacitors C 1 , C 2 , a boost converter 12 , an inverter 14 , current sensors 11 , 24 , and a controller 30 .
  • An alternating-current motor M 1 is a drive motor for generating torque for driving drive wheels of a hybrid car or an electric car.
  • the motor may have a function as a motor driven by an engine and may be mounted in the hybrid car as a motor operating for the engine and capable of starting the engine, for example.
  • Boost converter 12 includes a reactor L 1 , NPN transistors Q 1 , Q 2 , and diodes D 1 , D 2 .
  • One end of the reactor L 1 is connected to a power supply line PL 1 of direct-current power supply B and the other end is connected to an intermediate point between NPN transistor Q 1 and NPN transistor Q 2 , i.e., between an emitter of NPN transistor Q 1 and a collector of NPN transistor Q 2 .
  • NPN transistors Q 1 and Q 2 are connected in series between a power supply line PL 2 and a ground line SL.
  • a collector of NPN transistor Q 1 is connected to power supply line PL 2 and an emitter of NPN transistor Q 2 is connected to ground line SL.
  • diode D 1 or D 2 for passing an electric current from the emitter side to the collector side is disposed.
  • Inverter 14 includes a U-phase arm 15 , a V-phase arm 16 , and a W-phase arm 17 .
  • U-phase arm 15 , V-phase arm 16 , and W-phase arm 17 are provided in parallel between power supply line PL 2 and ground line SL.
  • U-phase arm 15 includes NPN transistors Q 3 , Q 4 connected in series.
  • V-phase arm 16 includes NPN transistors Q 5 , Q 6 connected in series.
  • W-phase arm 17 includes NPN transistors Q 7 , Q 8 connected in series. Between a collector and an emitter of each of NPN transistors Q 3 to Q 8 , each of diodes D 3 to D 8 is connected to pass an electric current from the emitter side to the collector side.
  • alternating-current motor M 1 is a three-phase permanent magnet and is formed of U-phase, V-phase, and W-phase three coils with their one ends commonly connected to a middle point.
  • the other end of the U-phase coil is connected to an intermediate point between NPN transistors Q 3 , Q 4
  • the other end of V-phase coil is connected to an intermediate point between NPN transistors Q 5 , Q 6
  • the other end of W-phase coil is connected to an intermediate point between NPN transistors Q 7 , Q 8 , respectively.
  • NPN transistors Q 1 to Q 8 In place of NPN transistors Q 1 to Q 8 and the like, other power switching elements such as IGBTs (insulated gate bipolar transistors) or power MOSFETs may be used.
  • IGBTs insulated gate bipolar transistors
  • MOSFETs power MOSFETs
  • Direct-current power supply B includes a nickel-hydride or lithium-ion secondary battery.
  • Voltage sensor 10 detects a direct-current voltage VB output from direct-current power supply B and outputs detected direct-current voltage VB to controller 30 .
  • Current sensor 11 detects a direct current Ib output from direct-current power supply B and outputs detected direct current Ib to controller 30 .
  • System relays SR 1 , SR 2 are turned on or off in response to a signal SE from controller 30 .
  • Capacitor C 1 smooths the direct-current voltage supplied from direct-current power supply B and supplies the smoothed direct-current voltage to boost converter 12 .
  • Boost converter 12 boosts the direct-current voltage supplied from capacitor C 1 to capacitor C 2 .
  • boost converter 12 receives a signal PWMU from controller 30 , it boosts the direct-current voltage and supplies the direct-current voltage to capacitor C 2 according to a time period over which NPN transistor Q 2 is ON in response to signal PWMU. In this case, NPN transistor Q 1 is OFF in response to signal PWMU.
  • boost converter 12 receives a signal PWMD from controller 30 , it steps down the direct-current voltage supplied from inverter 14 via capacitor C 2 to charge direct-current power supply B.
  • Capacitor C 2 smooths the direct-current voltage from boost converter 12 and supplies the smoothed direct-current voltage to inverter 14 .
  • Voltage sensor 13 detects voltages at opposite ends of capacitor C 2 , i.e., an output voltage VH of boost converter 12 (corresponding to an input voltage to inverter 14 .
  • VH an output voltage of boost converter 12
  • controller 30 outputs detected output voltage VH to controller 30 .
  • inverter 14 converts the direct-current voltage into an alternating voltage to drive alternating-current motor M 1 based on a signal PWMI from controller 30 .
  • alternating-current motor M 1 is driven to produce torque commanded by a torque command value TR.
  • inverter 14 converts the alternating voltage generated by alternating-current motor M 1 into a direct-current voltage based on a signal PWMC from controller 30 and supplies the converted direct-current voltage to boost converter 12 via capacitor C 2 .
  • the regenerative braking mentioned here includes braking involving regenerative electric power generation when a foot brake is operated by a driver driving the hybrid car or the electric car and deceleration (or stop of acceleration) of the vehicle while carrying out regenerative electric power generation by turning off an accelerator pedal during traveling without operating the foot brake.
  • Current sensors 24 detect a motor current MCRT passing through alternating-current motor M 1 and output detected motor current MCRT to controller 30 .
  • Controller 30 determines torque command value TR based on an accelerator press-down degree Acc obtained from an accelerator press-down degree sensor 32 , generates signal PWMU for driving boost converter 12 and signal PWMI for driving inverter 14 based on torque command value TR, a motor rotation number ON, direct-current voltage VB from voltage sensor 10 , output voltage VH from voltage sensor 13 , and motor current MCRT from current sensors 24 , and output generated signal PWMU and signal PWMI to boost converter 12 and inverter 14 , respectively.
  • Signal PWMU is a signal for driving boost converter 12 when boost converter 12 converts the direct-current voltage from capacitor C 1 into output voltage VH.
  • controller 30 feedback-controls output voltage VH and generates signal PWMU for driving boost converter 12 so that output voltage VH agrees with a target value.
  • controller 30 When controller 30 receives a signal indicating that the hybrid car or the electric car has been put into a regenerative braking mode from an external ECU, it generates signal PWMC for converting the alternating voltage generated by alternating-current motor M 1 into the direct-current voltage and outputs signal PWMC to inverter 14 . In this case, switching of NPN transistors Q 3 to Q 8 of inverter 14 is controlled by signal PWMC. In this way, inverter 14 converts the alternating voltage generated by alternating-current motor M 1 into the direct-current voltage and supplies the direct-current voltage to boost converter 12 .
  • controller 30 When controller 30 receives from the external ECU a signal indicating that the hybrid car or the electric car has been put into the regenerative braking mode, it generates signal PWMD for stepping down the direct-current voltage supplied from inverter 14 and outputs generated signal PWMD to boost converter 12 . In this way, the alternating voltage generated by alternating-current motor M 1 is converted into the direct-current voltage, stepped down, and supplied to direct-current power supply B.
  • controller 30 generates signals SE for turning on or off system relays SR 1 , SR 2 and outputs signals SE to system relays SR 1 , SR 2 .
  • Controller 30 determines an operation mode and controls inverter 14 based on pieces of information from accelerator press-down degree sensor 32 , an input switch 37 , and a navigation device 36 . Controller 30 informs an occupant of the determined operation mode by using a mode informing unit 34 .
  • FIG. 2 is a diagram showing control methods for controlling inverter 14 by controller 30 in FIG. 1 .
  • a motor current is often controlled according to a sinusoidal wave PWM (pulse-width-modulation) control based on a vector control in order to drive the alternating-current motor with high efficiency.
  • PWM pulse-width-modulation
  • a control configuration for applying a rectangular-wave voltage to an alternating-current motor to enhance an output in a high rotation region and driving the alternating-current motor for rotation, in which a torque control of the alternating-current motor is performed by controlling phase of the rectangular-wave voltage based on a deviation of a torque command value and actual torque from each other.
  • an overmodulation PWM control method for utilizing an intermediate voltage waveform between the rectangular-wave control method and the sinusoidal wave PWM control method.
  • switch is properly made among three control methods, i.e., the sinusoidal wave PWM control, the overmodulation PWM control, and the rectangular-wave control according to motor operation conditions (represented by torque and the rotation speed).
  • the sinusoidal wave PWM control method is one used as a general PWM control and controls ON/OFF of the switching elements of the respective phase arms according to comparison between voltages of a sinusoidal wave voltage command value and a carrier (represented by a triangular wave).
  • a carrier represented by a triangular wave.
  • duty ratio is controlled so that a group of fundamental wave components in a high-level period corresponding to an ON period of the upper arm element and a low-level period corresponding to an ON period of the lower arm element become sinusoidal waves in a certain time period.
  • an effective value of the fundamental wave component (modulation ratio) can be only enhanced up to 0.61 times an inverter direct-current input voltage.
  • one pulse of rectangular-wave including the high-level period and the low-level period at a ratio of one to one is applied to the alternating motor in the above-described certain time period.
  • the modulation ratio can be enhanced up to 0.78.
  • the overmodulation PWM control method carries out a PWM control similar to the above-described sinusoidal wave PWM control method after distorting the carrier to reduce amplitude.
  • the fundamental wave component can be distorted and the modulation ratio can be enhanced up to a range of 0.61 to 0.78.
  • boost converter 12 In alternating-current motor M 1 , if the rotation number or the output torque increases, an induced voltage becomes high and required voltage of the motor becomes high.
  • the boosted voltage by boost converter 12 i.e., system voltage VH need be set to be higher than the motor required voltage (induced voltage).
  • VH maximum voltage there is a limit value (VH maximum voltage) of the boosted voltage by boost converter 12 , i.e., system voltage VH.
  • a maximum torque control according to the sinusoidal wave PWM control method or the overmodulation PWM control method is applied and the output torque is controlled to be the torque command value by the motor current control according to the vector control.
  • the rectangular-wave control method according to a field weakening control is applied after maintaining system voltage VH.
  • the torque control is performed by the voltage phase control of the rectangular-wave pulses based on the deviation of the actual torque value and the torque command value from each other and obtained by the electric power arithmetic.
  • FIG. 3 is a diagram showing how to determine the control method at a certain boosted voltage.
  • the sinusoidal wave PWM control method is used in order to reduce torque variation in a low rotation speed region A 1
  • the overmodulation PWM control method is applied in a middle rotation speed region A 2
  • the rectangular-wave control method is applied in a high rotation speed region A 3 .
  • enhancement of the output of alternating-current motor M 1 in the middle rotation and high rotation speed regions can be achieved.
  • which one of the control methods shown in FIG. 2 is used is determined in a range of realizable modulation ratio.
  • FIG. 4 is a diagram for explaining a relationship between a boosted voltage by the boost converter and the control methods in FIG. 3 .
  • VH that is the output voltage of boost converter 12
  • VH 1 voltage VH that is the output voltage of boost converter 12
  • the sinusoidal wave PWM control method is used in low rotation speed region A 1
  • the overmodulation PWM control method is used in middle rotation speed region A 2
  • the rectangular-wave control method is used in high rotation speed region A 3 .
  • VH is VH 2 lower than VH 1
  • the sinusoidal wave PWM control method is used in a low rotation speed region B 1
  • the overmodulation PWM control method is used in a middle rotation speed region B 2
  • the rectangular-wave control method is used in a high rotation speed region B 3 .
  • Such maps are determined for each voltage VH and stored in advance in a memory incorporated in controller 30 .
  • VH is set to VH 2 .
  • boost converter 12 does not carry out much boosting.
  • Region Y belongs to region B 3 in map B and the rectangular-wave control method is applied. If battery voltage VB suffices as the voltage, the switching loss becomes zero.
  • the rectangular-wave control method involves lower switching loss than the sinusoidal wave PWM control method, because switching of power elements is less frequent in the rectangular-wave control method. Therefore, losses are reduced in both boost converter 12 and inverter 14 and therefore the fuel efficiency of the vehicle is improved.
  • This case is susceptible to disturbance and therefore it is preferable to restrict sudden change in the requested torque. For example, by moderating the change in the requested torque with respect to change in the accelerator press-down degree, it is possible to restrict the sudden change in the requested torque.
  • VH is set to VH 1 .
  • boost converter 12 carries out extra boosting
  • region Y belongs to region A 1 in map A, and inverter 14 is controlled by the sinusoidal wave PWM control method that provides high responsivity.
  • FIG. 5 is a flow chart showing a control configuration of a program executed by controller 30 in FIG. 1 for determining the boosted voltage and the control method. Processing in this flow chart is invoked and performed every time a certain time elapses or a predetermined condition is satisfied.
  • controller 30 first detects how input switch 37 is set in step S 1 .
  • input switch 37 in FIG. 1 is referred to as an eco-switch for setting an operation mode to a fuel efficiency-focused mode, for example.
  • An instruction on which to select from a normal mode and an eco-mode is provided from the eco-switch to controller 30 . If setting of the eco-switch is an ON state, the processing goes to step S 2 . If the setting of the eco-switch is an OFF state, the processing goes to step S 3 .
  • FIG. 6 is a diagram showing maps for determining the boosted voltage with respect to a load.
  • the load on a horizontal axis is proportional to the product of the torque and the rotation speed if the rotation is constant, for example.
  • FIG. 7 is a diagram showing maps for determining the requested torque with respect to the accelerator press-down degree.
  • step S 2 in FIG. 5 a boosted voltage target value is determined based on a voltage V 2 in FIG. 6 and the requested torque is determined based on requested torque T 2 in FIG. 7 .
  • step S 3 the boosted voltage target value is determined based on a voltage V 1 in FIG. 6 and the requested torque is determined based on requested torque T 1 in FIG. 7 .
  • step S 4 the torque command value is calculated from the requested torque determined based on the accelerator press-down degree.
  • controller 30 can select from requested torque T 1 and requested torque T 2 change of which is moderated in response to the same predetermine input signal Acc indicating a torque request and given by accelerator press-down degree sensor 32 . If the driver selects the normal mode by using input switch 37 , requested torque T 1 is selected. If the driver selects the eco-mode, requested torque T 2 is selected.
  • FIG. 8 is a waveform diagram for explaining another example for moderating change of the requested torque.
  • an input signal IN given by the accelerator press-down degree sensor is used as the requested torque after it is filtered, for example.
  • a signal OUT 1 is used as the requested torque in the normal mode and a signal OUT 2 the change of which is moderated as compared with signal OUT 1 is used as the requested torque in the eco-mode.
  • step S 5 description of the processing in step S 5 and steps after that performed following step S 4 will be continued.
  • step S 5 controller 30 determines the target value of boosted voltage VH by using the maps in FIG. 6 from the torque command value calculated in step S 4 and the motor rotation number detected by a resolver 38 . Then, the processing in step S 6 is performed following step S 5 .
  • step S 6 which one of the sinusoidal wave PWM control, the overmodulation PWM control, and the rectangular-wave control is used as the control method is determined from the maps determined for respective boosted voltages VH shown in FIG. 4 .
  • motor drive device 100 includes boost converter 12 boosting the power supply voltage and outputting the boosted voltage, inverter 14 receiving the boosted voltage from boost converter 12 and driving motor M 1 , and controller 30 giving the target value of the boosted voltage to boost converter 12 and setting one of the rectangular-wave control and the non-rectangular-wave control as the control method of inverter 14 .
  • the switching of the control method may be expressed as setting one of a pulse-width-modulation control and a non-pulse-width-modulation control.
  • controller 30 can select from a first operation mode (normal mode) for giving a first boosted target value V 1 and designating the non-rectangular-wave control as the control method and a second operation mode (eco-mode) for giving a second boosted target value V 2 lower than the first boosted target value V 1 and designating the rectangular-wave control as the control method in response to a same predetermined input signal indicating a torque request.
  • the driver can change the operation mode according to his/her liking by using input switch 37 .
  • step S 6 If the control method is determined in step S 6 , transistors Q 3 to Q 8 of inverter 14 are switched in step S 7 according to the control method to perform the current control of the motor. In step S 8 , the control shifts to a main routine.
  • processing for making an operator recognize which one of the normal mode and the eco-mode is selected is performed by using mode informing unit 34 before step S 4 .
  • Controller 30 selects from the operation mode (hereinafter referred to as the normal mode) focusing on ride quality and responsivity and the operation mode (hereinafter referred to as the eco-mode) focusing on the fuel efficiency according to setting of input switch 37 . Controller 30 informs the driver of which one of the normal mode and the eco-mode is currently selected as the operation mode by using mode informing unit 34 .
  • a light that illuminates when the eco-mode is selected may be provided or a meter panel having a background color changing according to the operation mode may be provided.
  • the air cleaner may emit a smell that gives an idea of forest bathing when the eco-mode is selected to thereby inform the driver that the eco-mode is selected.
  • controller 30 switches the operation mode from the normal mode to the eco-mode to use the map in step S 2 in place of the map in step S 3 when a traffic jam is predicted in a course based on information from navigation device 36 before the shift from step S 1 to S 3 .
  • traffic jam information provided from a traffic information providing service such as VICS (vehicle information and communication system) may be taken into navigation device 36 and the operation mode may be switched to the eco-mode at an expected time of arrival at a congested area if a traffic jam is detected in a course from a present location to a set destination.
  • VICS vehicle information and communication system
  • the operation mode providing high performance of the vehicle is referred to as the normal mode while the mode providing improved fuel efficiency is referred to as the eco-mode in the embodiment, it is not the only way.
  • the invention of the present application may be applied while referring the mode where providing the improved fuel efficiency as the normal mode and referring the operation mode providing the high performance of the vehicle as a power mode.
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JP4802849B2 (ja) 2011-10-26
EP2017952A1 (de) 2009-01-21
WO2007129760A1 (ja) 2007-11-15
CN101438488A (zh) 2009-05-20
EP2017952A4 (de) 2017-10-04
US20090121669A1 (en) 2009-05-14
CN101438488B (zh) 2011-09-21
JP2007306658A (ja) 2007-11-22
KR101050488B1 (ko) 2011-07-20
KR20090009960A (ko) 2009-01-23

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